misc(deps): Pin setuptools only for PyPy on Windows platform (#26)

README.rst

@@ -169,7 +169,7 @@ Changelog
 
 * **[NEXT]** (changes on master but not released yet):
 
-  * Nothing yet ;)
+  * misc(deps): Pin setuptools only for PyPy on Windows platform (@flozz, #26)
 
 * **v1.1.4:**
 

pyproject.toml

@@ -1,3 +1,7 @@
 [build-system]
-requires = ["setuptools<74"]
+requires = [
+    "setuptools",
+    # ↓ See https://github.com/wanadev/mozjpeg-lossless-optimization/issues/26
+    "setuptools<74; platform_system=='Windows' and implementation_name=='pypy'",
+]
 build-backend = "setuptools.build_meta"

setup.py

@@ -11,12 +11,25 @@
 def _find_msbuild(plat_spec="x64"):
     from setuptools import msvc
 
-    vc_env = msvc.msvc14_get_vc_env(plat_spec)
-    if "vsinstalldir" not in vc_env:
-        raise Exception("Unable to find any Visual Studio installation")
-    return os.path.join(
-        vc_env["vsinstalldir"], "MSBuild", "Current", "Bin", "MSBuild.exe"
-    )
+    if hasattr(msvc, "msvc14_get_vc_env"):
+        vc_env = msvc.msvc14_get_vc_env(plat_spec)
+        if "vsinstalldir" in vc_env:
+            msbuild_path = os.path.join(
+                vc_env["vsinstalldir"], "MSBuild", "Current", "Bin", "MSBuild.exe"
+            )
+            if os.path.isfile(msbuild_path):
+                return msbuild_path
+
+    for path in msvc.EnvironmentInfo(plat_spec).VCTools:
+        if "\\VC\\" not in path:
+            continue
+        msbuild_path = os.path.join(
+            path[: path.index("\\VC\\")], "MSBuild", "Current", "Bin", "MSBuild.exe"
+        )
+        if os.path.isfile(msbuild_path):
+            return msbuild_path
+
+    raise Exception("Unable to find any Visual Studio installation")
 
 
 class CustomBuildExt(build_ext):